binding | Martini handler for mapping and validating a raw request | Validation library
kandi X-RAY | binding Summary
kandi X-RAY | binding Summary
Each of these middleware handlers are independent and optional, though be aware that some handlers invoke other ones.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of binding
binding Key Features
binding Examples and Code Snippets
@Override
public void fulfill(T value) {
super.fulfill(value);
postFulfillment();
}
Community Discussions
Trending Discussions on binding
QUESTION
This question is about two MAUI controls (Switch
and ListView
) - I'm asking about them both in the same question as I'm expecting the root cause of the problem to be the same for both controls. It's entirely possible that they're different problems that just share some common symptoms though. (CollectionView
has similar issues, but other confounding factors that make it trickier to demonstrate.)
I'm using 2-way data binding in my MAUI app: changes to the data can either come directly from the user, or from a background polling task that checks whether the canonical data has been changed elsewhere. The problem I'm facing is that changes to the view model are not visually propagated to the Switch.IsToggled
and ListView.SelectedItem
properties, even though the controls do raise events showing that they've "noticed" the property changes. Other controls (e.g. Label
and Checkbox
) are visually updated, indicating that the view model notification is working fine and the UI itself is generally healthy.
Build environment: Visual Studio 2022 17.2.0 preview 2.1
App environment: Android, either emulator "Pixel 5 - API 30" or a real Pixel 6
The sample code is all below, but the fundamental question is whether this a bug somewhere in my code (do I need to "tell" the controls to update themselves for some reason?) or possibly a bug in MAUI (in which case I should presumably report it)?
Sample codeThe sample code below can be added directly a "File new project" MAUI app (with a name of "MauiPlayground" to use the same namespaces), or it's all available from my demo code repo. Each example is independent of the other - you can try just one. (Then update App.cs
to set MainPage
to the right example.)
Both examples have a very simple situation: a control with two-way binding to a view-model, and a button that updates the view-model property (to simulate "the data has been modified elsewhere" in the real app). In both cases, the control remains unchanged visually.
Note that I've specified {Binding ..., Mode=TwoWay}
in both cases, even though that's the default for those properties, just to be super-clear that that isn't the problem.
The ViewModelBase
code is shared by both examples, and is simply a convenient way of raising INotifyPropertyChanged.PropertyChanged
without any extra dependencies:
ViewModelBase.cs:
...ANSWER
Answered 2022-Apr-09 at 18:07These both may be bugs with the currently released version of MAUI.
This bug was recently posted and there is already a fix for the Switch to address this issue.
QUESTION
This code sample fails to compile due to ambiguous overload resolution
...ANSWER
Answered 2022-Mar-30 at 06:35The second overload is more specialized than the first one during partial ordering of function templates.
According to [temp.deduct.partial]/5 the reference on T &t
of the first overload is ignored during template argument deduction performed for partial ordering. The following paragraphs distinguish based on reference/value category only if both parameters are reference types.
Then T
of the first overload can always deduce against a type A*
invented from the parameter of the second overload, but T*
of the second overload can't deduce against a type A
invented from the parameter of the first overload.
Therefore the second overload is more specialized and is chosen.
With T (&t)[4]
argument deduction in both directions will fail because deduction of T[4]
against A*
will fail and so will deduction of T*
against A[4]
. Array-to-pointer decay of the array type is specified for template argument deduction for a function call but not for template argument deduction for partial ordering. See also active CWG issue 402.
So neither template will be more specialized in this case and the partial ordering tiebreaker does not apply.
The array-to-pointer conversion is not relevant. It is not considered any worse than the identity conversion sequence (see [over.ics.rank]/3.2.1 excluding lvalue transformations which array-to-pointer conversions are).
QUESTION
I have two WheelPickers contained inside a HStack for 'hour' and 'min'. Each Picker is set within a frame(width: 50, height: 30) and additionally clipped.
In iOS14, it behaved as expected and I could scrolled the 'hour' picker to change the hour and 'minute' picker to change the mins.
HOWEVER in iOS15, the 'minute' wheelpicker is extended beyond the frame width of 50 and overlapped into the 'hour' picker; if I scroll on the 'hour' picker, the 'mins' value changes (instead of 'hour' value), if I scroll on 'minute' picker, it changes the 'mins' as expected. If I touch on the far left outside the 'hour' picker, then the 'hour' value changes.
Anyone has the same issue and any workaround for this issue?
I came across a workaround to add 'mask(rectangle()' and tried it, but it did not work on iOS15.
...ANSWER
Answered 2021-Sep-09 at 23:46In NumberPicker
try adding compositingGroup
just before clipped(...)
as:
QUESTION
In [dcl.struct.bind] 9.6.4, there is definition of structured binding when initializer is a class type with std::tuple_size::value
properly defined:
... variables are introduced with unique names ri as follows:
S Ui ri = initializer ;
Each vi is the name of an lvalue of type Ti that refers to the object bound to ri; the referenced type is Ti.
My question is why is it necessary to introduce ri, can't we define the identifier vi directly as reference to the result of get(e)
?
ANSWER
Answered 2022-Mar-19 at 11:43The intent is to disallow redeclaring structured bindings as references. See CWG 2313.
QUESTION
After updating Android Studio to Arctic Fox and Android Gradle plugin to 7.0.0 I'm facing this warning, I mean the app can be built successfully nonetheless of this warning but what I am missing here? What's the problem here?
According to the official View Binding reference, I'm enabling it the right way. here is my build.gradle if anyone is interested in checking.
There are some related questions but I don't think they are relevant in this situation.
...ANSWER
Answered 2022-Jan-06 at 11:08Remove equal sign. On the screenshot you use Kotlin configuration, but Groovy is needed here. See the difference:
QUESTION
Haskell hobbyist here - is it possible to map a polymorphic constant over a list of types in a generic way?
More precisely, consider this snippet:
...ANSWER
Answered 2022-Feb-09 at 00:00I wish someone can prove me wrong, but this is one of the few corner cases where we meet a limitation of current GHC and we can not get away from using Proxy
, Tagged
or similar "relics" of the past.
Let's consider a simpler example:
QUESTION
Haskell provides a convenient function forever
that repeats a monadic effect indefinitely. It can be defined as follows:
ANSWER
Answered 2022-Feb-05 at 20:34The execution engine starts off with a pointer to your loop, and lazily expands it as it needs to find out what IO
action to execute next. With your definition of forever
, here's what a few iterations of the loop like like in terms of "objects stored in memory":
QUESTION
Ruby 2.7.4 Rails 6.1.4.1
note: in package.json
the engines
key is missing in my app
Heroku fails during build with this error
this commit is an empty commit on top of exactly a SHA that I was successful at pushing yesterday (I've checked twice now) so I suspect this is a platform problem or somehow the node-sass got deprecated or yanked yesterday?
how can I fix this?
...ANSWER
Answered 2022-Jan-06 at 18:23Heroku switched the default Node from 14 to 16 in Dec 2021 for the Ruby buildpack .
Heroku updated the heroku/ruby
buildpack Node version from Node 14 to Node 16 (see https://devcenter.heroku.com/changelog-items/2306) which is not compatible with the version of Node Sass locked in at the Webpack version you're likely using.
To fix it do these two things:
- Specify the 14.x Node version in
package.json
.
QUESTION
I am trying to update my SpringBoot maven project to Java 17.
...ANSWER
Answered 2021-Oct-25 at 06:28It compiles, when you'll add jaxb-runtime
dependency, as below:
QUESTION
I'm currently studying Jetpack Compose in an attempt to build a feature-rich application using modern Android architecture components. Traditionally, each screen (or navigation unit) in my application would be either an activity or a fragment, each with its own lifecycle bindings, but with Jetpack Compose and the Compose Navigation library, I would do something like this:
MainActivity.kt
:
ANSWER
Answered 2021-Aug-29 at 04:50The Compose application is designed to be used in a single-activity architecture with no fragments.
You can still have multiple activities or fragments and use setContent
in each of them, but in this case the transfer of data between activities falls on your shoulders. Use this approach if you're adding new Compose screens to an existing application built the old way.
But with Compose, it's much easier to do all the navigation within a single activity using Compose Navigation. Much less code, better performance due to no unnecessary code layers, easy to transfer data, etc.
To work with the view lifecycle, check out compose side-effects:
LaunchedEffect
can be used to execute an action when the view appears. It also runs on a coroutine context that is bound to the current composable: you can easily run suspend functions, and when the view disappears from view hierarchy - the coroutine will be canceled.DisposableEffect
can be used to subscribe to/unsubscribe from callbacks.
When you rotate the screen, all effects will restart no matter which key you passed.
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